Stackshare - StackShare is a comprehensive website that gives its users the chance to organize and share their technology stack with the rest of the community.
Startup Stash - A curated directory of 400 resources & tools for startups
Techmap.io - Techmap is a workplace search engine to find companies using technologies (e.g., Rails, PHP, Java, etc.) that are used internally. Finally, a "Google for Workplaces" that helps people find a place to work with technologies they love!
StartupResources.io - Tightly curated lists of the best startup tools
WhatRuns - Extension that helps you identify technologies used on any website at the click of a button.
Startup Collections - Resources & tools for entrepreneurs, designers & developers